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IB Biology HL C1.2.15 Hl Chemiosmosis Questions

Practise IB Biology HL 1.2.15 by applying chemiosmosis concepts to exam questions.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain that protons flow down their electrochemical gradient through ATP synthase.
  • Relate proton flow through ATP synthase to phosphorylation of ADP and ATP generation in oxidative phosphorylation.
  • Recognize chemiosmosis as a shared mechanism in mitochondrial cristae and thylakoid membranes.

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Study C1.2.15 (HL)—Chemiosmosis conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL C1.2.15 Hl Chemiosmosis Questions question 1

[Maximum number: 4]

The electron micrograph shows part of a cell including a mitochondrion.

Figure for Question IB Biology HL C1.2.15 Hl Chemiosmosis Questions question 1 — IB Biology HL

Explain how ATP is generated in mitochondria by chemiosmosis.

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